rozwiąż układy równań :
{2(x+y)-(x-y)=4
{3(x-2y)+4(x+y)=5
to wszystko w jednej klamrze
b)
{3(x+y)-2(x-2y)=5
{2(x+2)-4(y+1)=-8
to tez w jednej klamrze
bardzo prosze o b.szybkie rozwiaznie tego zadania. najlpeiej do 19. na jtr !!
bd nja! ;*
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a )2x+2y-x-y=4
3x-6y+4x+4y=5
x+y=4
7x-2y=5
x=4-y
7(4-y)-2y=5
x=4-y
28-7y-2y=5
x=4-y
-9y=5-28
x=4-y
-9y=-23 /(-9)
x=4-y
y=23/9
x=4-y
y= 2i 5/9
x=4-2i 5/9
y = 2i 5/9
x=3 i 9/9 - 2i 5/9
y=2 i 5/9
x= 1 i 4/9
y= 2 i 5/9
b)
3x+3y-2x+4y=5
2x+4-4y-4= -8
x+7y=5
2x-4y= -8
x=5-7y
2(5-7y)-4y= -8
x=5-7y
10-14y-4y=-8
x=5-7y
-18y=-8-10
x=5-7y
-18y=-18 /-18
x=5-7y
y=1
x=5-7*1
y=1
x=5-7
y=1
x= -2
y=1
mam nadzieje że pomogłam
a) {2(x+y)-(x-y)=4
{3(x-2y)+4(x+y)=5
{2x+2y-x+y=4
{3x-6y+4x+4y=5
{x+3y=4
{7x-2y=5
{x=4-3y
{7(4-3y)-2y=5
{x=4-3y
{28-21y-2y=5
{x=4-3y
{-23y=5-28
{x=4-3y
{-23y=-23|:(-23)
{x=4-3y
{y=1
{x=4-3*1
{y=1
{x=1
{y=1
b) {3(x+y)-2(x-2y)=5
{2(x+2)-4(y+1)=-8
{3x+3y-2x+4y=5
{2x+4-4y-4=-8
{x+7y=5
{2x-4y=-8-4+4
{x=5-7y
{2(5-7y)-4y=-8
{x=5-7y
{10-14y-4y=-8
{x=5-7y
{-18y=-18|:(-18)
{x=5-7y
{y=1
{x=5-7*1
{y=1
{x=-2
{y=1